engaged tone

: involved in activity : occupied, busy

: pledged to be married : betrothed

: greatly interested : committed

: vocal or musical sound of a specific quality

: a sound of definite pitch and vibration

: whole step

: to impart tone to : strengthen

: to soften or reduce in intensity, color, appearance, or sound : mellow

: to change the normal silver image of (something, such as a photographic print) into a colored image